/*
 * Copyright (C) 2011-2014 MediaTek Inc.
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.
 * If not, see <http://www.gnu.org/licenses/>.
 */

/******************************************************************************
 *  INCLUDE LINUX HEADER
 ******************************************************************************/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/unistd.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/version.h>
#include <linux/spinlock.h>
#include <linux/semaphore.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/errno.h>
#include <linux/cdev.h>
#include <linux/kdev_t.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/vmalloc.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/string.h>
/* #include <mach/memory.h> */
#include <linux/io.h>
#include <linux/device.h>
#include <linux/cdev.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/of_platform.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#ifdef CONFIG_OF
#include <linux/of_fdt.h>
#endif
/******************************************************************************
 *  INCLUDE LIBRARY
 ******************************************************************************/
#include "sec_osal.h"
#include "sec_mod.h"
#include "sec_boot_lib.h"
#include "sec_clk.h"
#ifdef MTK_SECURITY_MODULE_LITE
#include "masp_version.h"
#endif

#define SEC_DEV_NAME                "sec"
#define SEC_MAJOR                   182
#define MOD                         "MASP"

#define TRACE_FUNC()                MSG_FUNC(SEC_DEV_NAME)

/*************************************************************************
 *  GLOBAL VARIABLE
 **************************************************************************/
static struct sec_mod sec = { 0 };
static struct cdev sec_dev;
static struct class *sec_class;
static struct device *sec_device;

void __iomem *hacc_base;
static const struct of_device_id masp_of_ids[] = {
	{.compatible = "mediatek,hacc",},
	{}
};

/**************************************************************************
 *  SEC DRIVER OPEN
 **************************************************************************/
static int sec_open(struct inode *inode, struct file *file)
{
	return 0;
}

/**************************************************************************
 *  SEC DRIVER RELEASE
 **************************************************************************/
static int sec_release(struct inode *inode, struct file *file)
{
	return 0;
}

/**************************************************************************
 *  SEC DRIVER IOCTL
 **************************************************************************/
static long sec_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
#ifdef MTK_SECURITY_MODULE_LITE
	return -EIO;
#else
	return sec_core_ioctl(file, cmd, arg);
#endif
}

static const struct file_operations sec_fops = {
	.owner = THIS_MODULE,
	.open = sec_open,
	.release = sec_release,
	.write = NULL,
	.read = NULL,
	.unlocked_ioctl = sec_ioctl
};

/**************************************************************************
 *  SEC RID PROC FUNCTION
 **************************************************************************/
static int sec_proc_rid_show(struct seq_file *m, void *v)
{
	unsigned int rid[4] = { 0 };
	unsigned int i = 0;

	sec_get_random_id((unsigned int *)rid);

	for (i = 0; i < 16; i++)
		seq_putc(m, *((char *)rid + i));

	return 0;
}

static int sec_proc_rid_open(struct inode *inode, struct file *file)
{
	return single_open(file, sec_proc_rid_show, NULL);
}

static const struct file_operations sec_proc_rid_fops = {
	.open = sec_proc_rid_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release,
};


/**************************************************************************
 *  SEC MODULE PARAMETER
 **************************************************************************/
static uint recovery_done;
module_param(recovery_done, uint, 0644); /* rw-r--r-- */

MODULE_PARM_DESC(recovery_done,
		 "recovery_done status(0 = complete, 1 = on-going, 2 = error)");

/* SEC DRIVER INIT */
static int sec_init(struct platform_device *dev)
{
	int ret = 0;
	dev_t id;

	pr_debug("[%s] %s (%d)\n", SEC_DEV_NAME, __func__, ret);

	hacc_base = of_iomap(dev->dev.of_node, 0);
	if (!hacc_base) {
		pr_notice("[%s] hacc register remapping failed\n",
			  SEC_DEV_NAME);
		return -ENXIO;
	}

	ret = sec_clk_enable(dev);
	if (ret) {
		pr_notice("[%s] Cannot get hacc clock\n", SEC_DEV_NAME);
		return ret;
	}

	id = MKDEV(SEC_MAJOR, 0);
	ret = register_chrdev_region(id, 1, SEC_DEV_NAME);

	if (ret) {
		pr_notice("[%s] Regist Failed (%d)\n", SEC_DEV_NAME, ret);
		return ret;
	}

	sec_class = class_create(THIS_MODULE, SEC_DEV_NAME);
	if (sec_class == NULL) {
		pr_notice("[%s] Create class failed(0x%x)\n",
			  SEC_DEV_NAME,
			  ret);
		ret = -1;
		return ret;
	}

	cdev_init(&sec_dev, &sec_fops);
	sec_dev.owner = THIS_MODULE;

	ret = cdev_add(&sec_dev, id, 1);
	if (ret < 0)
		goto exit;

	sec_device = device_create(sec_class, NULL, id, NULL, SEC_DEV_NAME);
	if (sec_class == NULL) {
		pr_notice("[%s] Create device failed(0x%x)\n",
			  SEC_DEV_NAME,
			  ret);
		class_destroy(sec_class);
		ret = -1;
		return ret;
	}

	sec.id = id;
	sec.init = 1;
	spin_lock_init(&sec.lock);

	proc_create("rid", 0444, NULL, &sec_proc_rid_fops);

#ifdef MTK_SECURITY_MODULE_LITE
	pr_debug("[MASP Lite] version '%s%s', enter.\n",
		 BUILD_TIME,
		 BUILD_BRANCH);
#endif

exit:
	if (ret != 0) {
		device_destroy(sec_class, id);
		class_destroy(sec_class);
		unregister_chrdev_region(id, 1);
		memset(&sec, 0, sizeof(sec));
	}

	return ret;
}


/**************************************************************************
 *  SEC DRIVER EXIT
 **************************************************************************/
static void sec_exit(void)
{
	remove_proc_entry("rid", NULL);
	cdev_del(&sec_dev);
	unregister_chrdev_region(sec.id, 1);
	memset(&sec, 0, sizeof(sec));

#ifdef MTK_SECURITY_MODULE_LITE
	pr_debug("[MASP Lite] version '%s%s', exit.\n",
		 BUILD_TIME,
		 BUILD_BRANCH);
#else
	sec_core_exit();
#endif
}

/**************************************************************************
 *  MASP PLATFORM DRIVER WRAPPER, FOR BUILD-IN SEQUENCE
 **************************************************************************/
int masp_probe(struct platform_device *dev)
{
	int ret = 0;

	ret = sec_init(dev);
	return ret;
}


int masp_remove(struct platform_device *dev)
{
	sec_exit();
	return 0;
}

static struct platform_driver masp_driver = {
	.driver = {
		.name = "masp",
		.owner = THIS_MODULE,
		.of_match_table = masp_of_ids,
	},
	.probe = masp_probe,
	.remove = masp_remove,
};

static int __init masp_init(void)
{
	int ret;

	ret = platform_driver_register(&masp_driver);
	if (ret) {
		pr_notice("[%s] Reg platform driver failed (%d)\n",
			  SEC_DEV_NAME,
			  ret);
		return ret;
	}

	return ret;
}

#ifdef CONFIG_OF
static int __init masp_parse_dt(unsigned long node,
				const char *uname,
				int depth,
				void *data)
{
	struct masp_tag *tags;
	int i;

	if (depth != 1 || (strcmp(uname, "chosen") != 0 &&
			   strcmp(uname, "chosen@0") != 0))
		return 0;

	tags = (struct masp_tag *)of_get_flat_dt_prop(node, "atag,masp", NULL);
	if (tags) {
		g_rom_info_sbc_attr = tags->rom_info_sbc_attr;
		g_rom_info_sdl_attr = tags->rom_info_sdl_attr;
		g_hw_sbcen = tags->hw_sbcen;
		g_lock_state = tags->lock_state;
		lks = tags->lock_state;
		for (i = 0; i < NUM_RID; i++)
			g_random_id[i] = tags->rid[i];
		for (i = 0; i < NUM_CRYPTO_SEED; i++)
			g_crypto_seed[i] = tags->crypto_seed[i];
		for (i = 0; i < NUM_SBC_PUBK_HASH; i++)
			g_sbc_pubk_hash[i] = tags->sbc_pubk_hash[i];
	}
	return 1;
}

static int __init masp_of_init(void)
{
	of_scan_flat_dt(masp_parse_dt, NULL);
	return 0;
}
#endif
static void __exit masp_exit(void)
{
	/*platform_driver_unregister(&es_driver);*/
	platform_driver_unregister(&masp_driver);
}
module_init(masp_init);
module_exit(masp_exit);

/**************************************************************************
 *  EXPORT FUNCTION
 **************************************************************************/
EXPORT_SYMBOL(sec_get_random_id);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("MediaTek Inc.");
#ifdef CONFIG_OF
early_initcall(masp_of_init);
#endif
#ifdef MTK_SECURITY_MODULE_LITE
MODULE_DESCRIPTION("Mediatek Security Module Lite");
#else
MODULE_DESCRIPTION("Mediatek Security Module");
#endif
